Shihong Zhang^* , Hui Yang

Frontiers in Heat and Mass Transfer, Vol.12, pp. 1-5, 2019, DOI:10.5098/hmt.12.6

Abstract This article discussed the lifetime of catalyst on cost effect for catalytic combustion furnace and applications of pottery heated by catalytic combustion furnace in purification water. The time of start-up process rises with the increase of the number of ignition. The catalyst sintering was remarkable. By reducing the number of ignition and adjusting the temperature rise uniformly in the furnace, the efficient utilization of thermal energy could be realized to saving production cost and extending the lifetime of catalyst. With exquisite and even-textured surface the pottery had striking purification effect on water. The water purification material of this pottery was… More >

Medta Boupan^1,2, Kanyapak Prompang¹, Achiraya Chompunuch¹, Piwat Boonma¹, Arthit Neramittagapong^1,2,3,4, Somnuk Theerakulpisut⁵, Sutasinee Neramittagapong^1,2,3,*

Journal of Renewable Materials, Vol.11, No.7, pp. 2985-3000, 2023, DOI:10.32604/jrm.2023.026397

Abstract Isosorbide is a multi-purpose chemical that can be produced from renewable resources. Specifically, it has been investigated as a replacement for toxic bisphenol A (BPA) in the production of polycarbonate (PC). In this study, the synthesis of isosorbide by sorbitol dehydration using a cerium-based catalyst derived from calcined cerium (IV) sulfate (300°C, 400°C, 450°C, 500°C, and 650°C) was investigated. The reaction occurred in a high-pressure reactor containing nitrogen gas. Advanced instrumental techniques were applied to analyze the characteristics of the calcined catalyst. The results showed that the calcined catalysts demonstrated different crystalline structures and sulfate species at different temperatures. However,… More > Graphic Abstract

Xun Liu, Li Chen^* , Wen-Quan Tao

Frontiers in Heat and Mass Transfer, Vol.14, pp. 1-9, 2020, DOI:10.5098/hmt.14.16

Abstract Fluid flow, mass transport and catalytic reaction in micro-reactors with catalyst are studied. Optimized structures of the catalyst generating the maximum reaction rate are explored by numerically solving the reactive transport processes combined with topology optimization schemes in COMSOL 5.3a. Effects of several physicochemical parameters including pressure drop, reaction rate constant, permeability of the porous catalyst and radius of the reactor are investigated. Distributions of the optimized structures, velocity, pressure and concentration are discussed in detail. Results show that the four physicochemical parameters have significant effects on the optimized structures of the catalyst obtained, indicating that generally there does not… More >

Yihua Gao¹, Fuping Qian^2,*, Yi Sun², Yue Wu², Shenghua Wu², Jinli Lu¹, Yunlong Han¹, Naijin Huang³

FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.8, pp. 1997-2011, 2023, DOI:10.32604/fdmp.2023.026373

Abstract Selective catalytic reduction (SCR) is a technology by which nitrogen oxides are converted with the aid of a catalyst into diatomic nitrogen and water. It is known that the catalyst can be easily eroded if a cement kiln with a high-dust content is considered. To understand this process, numerical simulations have been carried out considering a single catalyst channel in order to study the collision and erosion of fly ash and catalysts at meso scale. Based on a response surface methodology, the effects of five factors on the erosion rate have been studied, namely, the catalyst particle velocity, the particle… More > Graphic Abstract

Zhiqiang Sun, Ranlong Duan, Han Zhang, Xuan Pang^*, Xianhong Wang, Xuesi Chen

Journal of Renewable Materials, Vol.3, No.2, pp. 82-90, 2015, DOI:10.7569/JRM.2014.634133

Abstract A series of bimetallic Salen aluminum (III) complexes with different steric substituents were synthesized. These complexes were used as catalysts to produce polylactide in the ring-opening polymerization of racemic lactide. A kinetic research of polymerization demonstrated that the steric substituents on the phenolate ring of the complexes had remarkable infl uence on the stereoselectivity and the polymerization activity. The highest stereoselectivity was obtained with bulky substituent on the ortho position of the salicylidene moieties. Kinetic studies using all these complexes indicated that the polymerizations were fi rst-ordered with respect to lactide monomers. All these complexes gave highly isotactic polylactides with… More >

Yizhang Wang¹, Zhaoyang Yu¹, Jinbo Hu^1,2,*, Shanshan Chang¹, Yuan Liu¹, Ting Li², Gonggang Liu^1,*, Xiaodong (Alice) Wang³

Journal of Renewable Materials, Vol.11, No.1, pp. 147-165, 2023, DOI:10.32604/jrm.2023.021306

Abstract In this paper, the residue from bamboo factory has been used to design photo-Fenton catalyst, which has the advantages of low cost and magnetic recycling. The photo-Fenton catalytic performance of the biocarbon-based catalyst was excellent and its optimal preparation process was also explored by response surface methodology. First, bamboo-carbon fiber was selected as the photo-Fenton catalyst carrier. Subsequently, the surface of the carbon fiber was modified, with which dopamine, nano-Fe₃O₄ and nano-TiO₂ were successively loaded by hydrothermal method. After examined single factor tests, four factors including dopamine concentration, ferric chloride mass, P25 titanium dioxide mass and liquid-solid ratio were selected… More > Graphic Abstract

Stefanos Tzelepis^*, Kosmas A. Kavadias

Energy Engineering, Vol.119, No.5, pp. 1745-1769, 2022, DOI:10.32604/ee.2022.020984

Abstract

The constant increase in energy demand and related environmental issues have made fuel cells an attractive technology as an alternative to conventional energy technologies. Like any technology, fuel cells face drawbacks that scientific society has been focused on to improve and optimize the overall technology. Thus, the cost is the main inhibitor for this technology due to the significantly high cost of the materials used in catalyst layers. The current discussion mainly focuses on the fundamental electrochemical half-cell reaction of hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR) that are taking place in the catalyst layers consisting of Platinum-based… More >

Lujiang Xu, Geliang Xie, Xianjun Zhou, Yucheng Liu, Zhen Fang^*

Journal of Renewable Materials, Vol.10, No.12, pp. 3107-3118, 2022, DOI:10.32604/jrm.2022.020691

Abstract In this paper, CaO/bio-char was synthesized by directly co-pyrolysis of Ca(OH)₂ and rice straw, and used as catalyst to catalytic pyrolysis of soybean oil to produce high quality biofuel. In this co-pyrolysis process, CaO particles has been successfully embedded on the bio-char surface. During the catalytic pyrolysis process, CaO/bio-char showed a good catalytic performance on the deoxygenation of soybean oil. Pyrolysis temperature affected the pyrolysis reactions and pyrolytic products distributions dramatically, higher pyrolysis temperature lead to seriously cracking reactions, lower bio-oil yield and higher gases yield, and lower pyrolysis temperature lead to higher bio-oil yield with higher oxygenated compounds content… More > Graphic Abstract

Sumari Sumari^*, Mega Murti, Aman Santoso, Muhammad Roy Asrori

Journal of Renewable Materials, Vol.10, No.12, pp. 3659-3670, 2022, DOI:10.32604/jrm.2022.022995

Abstract Kapok seed oil is an environmentally friendly biodiesel feedstock. The problem of the best catalyst for transesterification of Kapok seed oil still continues today. The research developed a base-heterogeneous catalyst with the effect of ultrasonic waves during transesterification. So, the study aims: (1) to determine the type of natural zeolite used, (2) to determine the characteristics of the synthesized CaO:BaO/ANZ catalyst, and (3) to determine the effectiveness of the CaO:BaO/ANZ catalyst in the biodiesel production process through sono-transesterification of kapok seed oil. The research stages consisted of: (1) activation of natural zeolite and its characterization, (2) preparation of CaO:BaO/ANZ catalyst,… More > Graphic Abstract

Aman Santoso^1,*, Amirotus Sholikhah¹, Sumari Sumari¹, Muhammad Roy Asrori¹, Anugrah Ricky Wijaya¹, Rini Retnosari^1,2, Ihsan Budi Rachman^1,3

Journal of Renewable Materials, Vol.10, No.11, pp. 2781-2789, 2022, DOI:10.32604/jrm.2022.021401

Abstract Plastic is a basic need for humans, but it has also caused big problems for the environment. Then, the purpose of this study was to determine the effect of the type of plastic and the addition of a zeolite catalyst on the oil yield from the pyrolysis of plastic waste. The research stages were natural zeolite activation, pyrolysis reactor settings, pyrolysis of plastic waste (PP and LDPE types), and characterization. The results showed that the used natural zeolite had a mordenite phase and activated natural zeolite had a higher Si/Al ratio than the inactivated one. The addition of a zeolite… More > Graphic Abstract