Preparation and hydrodeoxygenation properties of Co–Mo–O–B amorphous catalyst

Abstract

Co-Mo-O-B amorphous catalysts were prepared by the chemical reduction method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma (ICP) and X-ray photoelectron spectroscopy (XPS). The hydrodeoxygenation (HDO) properties of these catalysts were tested using phenol as the model compound. The catalyst preparation time had no influence on their amorphous structure but a great effect on the catalyst surface composition and the HDO activity. With the prolongation of preparation time, the catalyst particle size and the relative content of Co on the catalyst surface were increased gradually. The conversion of phenol could be as high as 100% with a selectivity of 99.6% for deoxygenation. The aromatics content in the products could be decreased to below 2% and the total H/C atomic ratio could be improved to 1.98. The pseudo first-order reaction rate constant of the phenol transformation on Co-Mo-O-B amorphous catalyst was high to 0.67 mL/(g catalyst s). The main reaction route in the HDO of phenol on Co-Mo-O-B amorphous catalyst proceeded with hydrogenation-dehydration rather than direct hydrogenolysis.

Hydrodeoxygenation of Octanoic Acid over the Mo–Doped CeO2‐Supported Bimetal Catalysts: The Role of Mo

“…Specifically, Mo 4+ is present in NiMo/CeO 2 in the form of Mo‐OH . With a long electron pair donated from oxygen, the metal site absorbs oxygenates and thereby polarizes C‐O bond . Therefore, the high content of amorphous MoO 2 promote the absorption of sufficient free hydrogen on neighboring active sites and support the conversion of octanoic acid to octanal.…”

Hydrodeoxygenation of p-cresol on MoS2: the effect of adding hexadecyl trimethyl ammonium bromide during the catalyst synthesis

“…Third, some new catalysts such as phosphide, nitrides and metal catalysts were developed [27][28][29][30][31][32][33]. Recently, we also prepared non-sulfided Mo-based and W-based amorphous catalysts by chemical reduction method [34][35][36][37][38]. These catalysts exhibited high HDO activity but insufficient stability due to the amorphous structure.…”

AKTIVITAS DAN SELEKTIVITAS KATALIS Mo-Co/USY PADA REAKSI HIDRODEOKSIGENASI ANISOL

“…Pada reaksi hidrodeoksigenasi, fungsi katalis adalah menyediakan seluruh permukaan untuk mengadsorpsi molekulmolekul reaktan secara kimia sehingga terbentuk kompleks kimia tak stabil antara katalis dengan molekul-molekul reaktan yang menyebabkan terjadi reaksi di antara reaktan-reaktan pada permukaan katalis (Gates, 1979 (Wang et al, 2011).…”

“…Logam Mo akan lebih memegang peranan untuk reaksi deoksigenasi (Kubicka et al, 2010). Logam Mo bertindak sebagai sisi asam Brønsted yang dapat mengaktifkan C-O (Wang et al, 2011). Situs asam dari USY berfungsi sebagai situs aktif bagi reaksi-reaksi hidrogenasi dan dehidrogenasi sehingga gabungan antara logam dengan pengemban Ultra Stable Y-zeolite (USY) akan menghasilkan katalis yang bersifat multifungsional (Nugrahaningtyas, 2009 (Romero, 2010).…”