HZSM-5 Zeolites with Different SiO2/Al2O3 Ratios.
网页2014年1月24日 · This article reports the influence of the SiO 2 /Al 2 O 3 ratio (30, 80, and 280) on HZSM-5 zeolite properties. XRD patterns show a decrease in the XRD peak intensity at low 2θ angles for low SiO 2 /Al 2 O 3 ratio zeolites. N 2 adsorption and desorption isotherms display hysteresis with both micropores and mesopores likely contributing to the ...
ZSM-5分子筛 - 百度百科
网页ZSM-5沸石是美国Mobil公司于上个世纪六十年代末合成出来的一种含有机胺阳离子的新型沸石分子筛。 由于它在化学组成、晶体结构及物化性质方面具有许多独特性,因此在很多有机催化反应中显示出了优异的催化效能,在工业上得到了越来越广泛的应用,成为石油 ...
Direct synthesis of HZSM-5 zeolites with enhanced catalytic …
网页2022年12月1日 · HZSM-5 zeolites were directly synthesized via a two-stage crystallization method using ammonia hydroxide as an alkaline source instead of the conventional sodium hydroxide, and their performance in the methanol-to-propylene (MTP) reaction was investigated at 470 °C.
Maximizing sinusoidal channels of HZSM-5 for high shape
网页2019年9月25日 · HZSM-5 is a well-known shape-selective zeolite that showed very high selectivity toward para-xylene (p-xylene), the most desirable xylene isomer in methanol–toluene alkylation reaction, when its...
H-ZSM-5 zeolite model crystals: Structure-diffusion-activity ...
网页2017年1月1日 · Large ZSM-5 zeolite crystals synthesized in fluoride medium show an astonishing activity, stability as well as selectivity towards light olefins in the Methanol-To-Olefins (MTO) reaction. By proper control of the synthesis parameters, ZSM-5 single crystals of unprecedented high quality are produced. The absence of usually uncontrollable ...
Performance of HZSM-5 prepared by different methods for
网页2021年7月29日 · Nanoscale polymer spherical and hollow structure HZSM-5 zeolites are prepared by hydrothermal and desilication–recrystallization methods. In addition, the crystallite size of two types of HZSM-5 can be easily …
Niobium-Modified HZSM-5 Zeolite Catalyzes Low-Energy …
网页2024年6月3日 · We developed an efficient solid acid catalyst, niobium-modified HZSM-5 (Nb/HZ), to facilitate CO 2 desorption from the CO 2-captured MEA solutions. The Nb/HZ catalysts with various niobium loadings were synthesized by using an impregnation method. HZSM-5 retained its pore structure and large surface area after niobium incorporation.
HZSM-5 zeolite modification and catalytic reaction mechanism in …
网页This paper prepared HCl-OTS-HZSM-5 zeolite catalyst by acid and alkylation modification and investigated olefin hydration reaction effects. Acid modification removes some HZSM-5 zeolite aluminum atoms, increasing specific surface area, pore volume, and …
Direct synthesis of H type ZSM-5 in shaped form and catalytic ...
网页2022年4月1日 · HZSM-5 zeolites as catalysts are conventionally synthesized through three steps: (1) preparation of Na type zeolites; (2) ion exchange into NH4 type; (3) calcination. In this work, binder-free HZSM-5 zeolites with SiO2/Al2O3 ratios of 50–170 were directly synthesized in the shaped form.
Preparation of HZSM-5 catalysts with different ratios of structure ...
网页2020年5月1日 · Compared to those of other zeolite-based catalysts such as HMOR, HBEA, and USY, HZSM-5 exhibits better catalytic activity and stability as well as higher selectivity for light alkenes, as well as less sensitivity to deactivation by coke when used in n-hexane cracking at high pressure [26].
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