Niobic Acid Dispersed on the Surface of TS-1: Acidity Study*

Bifunctional oxidative and acidic catalyst was prepared by incorporation of titanium ion (Ti 4+ ) and niobic acid in zeolite molecular-sieve. Nb/TS-1 was prepared by hydrothermal synthesis of Titanium silicalite, TS-1, calcination in air and subsequent impregnation of niobium (3-20 wt% Nb2O5) into TS-1. Acidity of the sample was characterized by pyridine adsorption technique. Pyridine adsorption study shows both Bronsted and Lewis acid sites are present in all Nb/TS-1 samples. ABSTRAK Katalis oksidatif bifungsional dan asam telah dipersiapkan melalui penggabungan ion titanium (Ti4+) dan asam niobat di dalam penyaring-molekuler zeolit. Nb/TS-1 dipersiapkan secara sintesis hidrotermal titanium silikat, TS-1, kalsinasi di udara dan penjenuhan niobium (3-20 % berat Nb2O5) ke dalam TS-1. Keasaman contoh dikarakterisasi dengan teknik adsorpsi piridin. Pengkajian adsorpsi piridin memperlihatkan bahwa kedua asam Bronsted dan asam Lewis terdapat di seluruh contoh Nb/TS-1.