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Synthesis and performance evaluation of hydrocracking catalysts: A review
Roba Saab,Kyriaki Polychronopoulou,Lianxi Zheng,S. Kumar,Andreas Schiffer 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
This review provides a comprehensive summary of current hydrocracking applications, and presentsrecent advances in the synthesis and structure/composition control of various nanomaterials used inhydrocracking catalysts. Although a wide range of feeds are considered in this review, particular focus isplaced on hydrocracking of aromatic and paraffinic compounds. The significance, concepts and principlesof the hydrocracking process arefirst discussed focusing on its wide range of industrial applications. Then, recent advances in the synthesis of hydrocracking catalysts are presented, including different typesof zeolites and metal promoted catalysts. Finally, we compare the performances of a wide range ofhydrocracking catalysts, and discuss how their intrinsic properties (e.g. surface area, porosity, acidity,morphology and structure) can be controlled to achieve optimal catalytic performance in hydrocrackingof aromatic compounds, heavy petrochemicals, paraffinic hydrocarbons and vegetable oils.
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Hari Krishna Salila Vijayalal Mohan,Jianing An,Kin Liao,Chee How Wong,Lianxi Zheng 한국물리학회 2014 Current Applied Physics Vol.14 No.12
Carbon nanotubes (CNTs) in a chemiresistor setup have been widely explored in bio/chemical sensing. Detection of certain molecules with environmental and health related importance such as 9- anthracenecarboxylic acid, diclofenac sodium, and curcumin using electrochemical methods/unfunctionalized CNTs suffer from lack of response, high limit of detection (LOD) and poor selectivity. The key to overcome these issues is to decorate CNTs with host (receptor) molecules like b-cyclodextrin (b-CD) that interact with guest (target) molecules by hosteguest complex formation. To improve guest recognition, and consequently, the sensor performance, effective immobilization of b-CD on the CNT surface using a non-covalent bridging molecule such as 3, 4, 9, 10-perylene tetracarboxylic acid (PTCA) is required. Furthermore, the selectivity can be assessed using the conductance correlation patterns of different host eguest systems in conjunction with a pattern classification tool. Our results indicate that PTCA linked b- CD-decorated CNT chemiresistors showed a good linear detection range (~100 pMe100 nM), sensitivity (~3 103e9 102 nM1) and LOD (~62 pMe101 nM), compared to devices without PTCA, in the detection of the guest molecules. The distinction in correlation patterns of different hosteguest systems was corroborated by pattern classification yielding a classification accuracy, sensitivity, and specificity of ~91.83%, ~90.13%, and ~85.39%, respectively.
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