摘要:
Disclosed are a hydrothermally stable porous molecular sieve catalyst and a preparation method thereof. The catalyst consists of a product obtained by the evaporation of water from a raw material mixture comprising a molecular sieve having a framework of Si-OH-Al-, a water- insoluble metal salt and a phosphate compound. The catalyst maintains its physical and chemical stabilities even in an atmosphere of high temperature and humidity. Accordingly, the catalyst shows excellent catalytic activity even when it is used in a severe process environment of high temperature and humidity in heterogeneous catalytic reactions, such as various oxidation/reduction reactions, including catalytic cracking reactions, isomerization reactions, alkylation reactions and esterification reactions.
摘要:
Disclosed is a process for producing light olefins from hydrocarbon feedstock. The process is characterized in that a porous molecular sieve catalyst consisting of a product obtained by evaporating water from a raw material mixture comprising a molecular sieve with a framework of Si-OH-Al- groups, a water-insoluble metal salt, and a phosphate compound, is used to produce light olefins, particularly ethylene and propylene, from hydrocarbon, while maintaining excellent selectivity to light olefins. According to the process, by the use of a specific catalyst with hydrothermal stability, light olefins can be selectively produced in high yield with high selectivity from hydrocarbon feedstock, particularly full-range naphtha In particular, the process can maintain higher cracking activity than the reaction temperature required in the prior thermal cracking process for the production of light olefins, and thus, can produce light olefins with high selectivity and conversion from hydrocarbon feedstock.
摘要:
A molecular sieve catalyst and a preparation method thereof to produce light olefins from catalytically cracking naphtha in severe environments of high temperature and high moisture, are disclosed. In detail, the catalyst is prepared by spray-drying and calcining the mixed slurry, in which 0.01~5.0 wt% of MnO 2 and 1~15 wt% of P 2 O 5 are simultaneously embedded in catalyst which consists of zeolite, clay and inorganic complex. According to the present invention, the method that manganese and phosphate are embedded simultaneously in zeolite and inorganic complex is used to increase thermal-stability of obtained spherical catalyst, and increase olefin yield of cracking hydrocarbon such as naphtha by protecting acid-site of zeolite. To synthesize the required catalyst, the important procedures are mixing ratio and mixing sequence of Mn, P, zeolite, and inorganic complex.
摘要翻译:分子筛催化剂及其制备方法,以从在高温和高湿度的恶劣环境催化裂解石脑油产生轻质烯烃,是游离缺失盘。 详细地,该催化剂是通过喷雾干燥制备,并且煅烧该混合浆料,二氧化锰,其中12:01〜5.0重量%和P:1〜15重量%的2 O 5同时嵌入到催化剂,其besteht沸石,粘土和 无机复合。 。根据本发明,该方法确实锰和磷酸盐在沸石同时嵌入和无机复合用于增加得到的球形催化剂的热稳定性,并提高裂化烃的烯烃产率:如通过保护沸石的酸性部位石脑油。 为了合成所要求的催化剂,重要的程序混合比和Mn,P,沸石的混合序列,和无机复合。
摘要:
Disclosed is a porous solid acid catalyst for producing light olefins. The catalyst is prepared through pillaring and a solid state reaction of a raw material mixture, and is made of a porous material having a crystalline structure that is different from that of the raw material mixture. The catalyst exhibits an excellent catalytic activity (i.e., conversion and selectivity) in the production of light olefins from hydrocarbon feeds such as full range naphthas.
摘要:
Disclosed are a hydrothermally stable porous molecular sieve catalyst and a preparation method thereof. The catalyst consists of a product obtained by the evaporation of water from a raw material mixture comprising a molecular sieve having a framework of Si-OH-Al-, a water-insoluble metal salt and a phosphate compound. The catalyst maintains its physical and chemical stabilities even in an atmosphere of high temperature and humidity. Accordingly, the catalyst shows excellent catalytic activity even when it is used in a severe process environment of high temperature and humidity in heterogeneous catalytic reactions, such as various oxidation/reduction reactions, including catalytic cracking reactions, isomerization reactions, alkylation reactions and esterification reactions.
摘要:
Disclosed herein is a method of preparing ZSM-5, including: providing a nanocrystalline ZSM-5 seed having a size of 70 ~ 300 nm; adding the nanocrystalline ZSM-5 seed to a stock solution including water glass as a silica source, an alumina source, a neutralizer and water to form a reaction mixture; and maintaining the reaction mixture at 150 ~ 200℃ to crystallize the reaction mixture. The method is advantageous in that ZSM-5 having small and uniform crystal sizes and including no impurities can be synthesized in a short period of time.