Synthesis of stable Ti-containing mesoporous tubular membrane using silicalite-1 nanoparticles as seeds
MetadataShow full item record
Stable Ti-containing mesoporous membranes were successfully synthesized on different porous alumina tubes using nanosized Sil-1 particles as seeds by hydrothermal treatment, starting from sols having both CTABr and TPAOH structure directing agents. The samples were characterized by various techniques and tested in the gas permeation and hydroxylation reactions. The SEM images and XRD pattern detected a continuous membrane with well-ordered hexagonal mesoporous structure formed on the inner surface of ceramic tubes. Membranes prepared in the presence of zeolite nanocrystal seeds had zeolite structure units in the mesopore walls verified by FTIR, thus giving a better hydrothermal stability. The characterizations by EDX, XPS, FTIR and UV–Vis indicated that most of titanium in the growth solution was incorporated into the zeolite framework. Ti-containing mesoporous membranes prepared on the Sil-1 seeded support had larger proportions of tetrahedrally coordinated titanium, leading to better reaction activities and conversion rates. More Sil-1 nanoparticle seeds could promote more mesoporous zeolite to deposit on the support resulting in the formation of thicker mesoporous membrane. The gas permeation results confirmed that gas transport through the calcined mesoporous membrane was governed by Knudsen diffusion. Sil-1 seeding is a promising method to prepare high quality Ti-containing mesoporous membranes on porous ceramic tubes of different pore sizes.
Showing items related by title, author, creator and subject.
Wang, X.; Sun, M.; Meng, B.; Yang, N.; Zhuang, S.; Tan, X.; Liu, Shaomin (2016)© 2016 Elsevier B.V. Mesostructured titanosilicates (Ti-MS1) possessing zeolitic secondary building units (SBU) can be successfully assembled from Sil-1 nanoparticle seeds. The influence of Sil-1 nanoparticle seeds on the ...
Direct Hydroxylation of Benzene to Phenol Using Palladium-Titanium Silicalite Zeolite Bifunctional Membrane ReactorsWang, X.; Meng, B.; Tan, X.; Zhang, X.; Zhuang, S.; Liu, Lihong. (2014)A series of titanium silicalite zeolite catalysts were successfully incorporated inside a Pd membrane reactor aiming to improve the direct hydroxylation of benzene to phenol. The correlation between the membrane structure ...
Eda, T.; Miyajima, K.; Watanabe, H.; Nair, Balagopal; Honda, S.; Iwamoto, Y. (2011)The application of zeolite membranes for the dehydration of chemical products such as alcohol has great potential to decrease the energy consumption and hence CO2 emission from chemical plants. In order to improve the ...