Precisely regulating the acidity of mesoporous silica on the catalytic performance of 1-decene oligomerization

Abstract

Significant progresses have been made in the homogeneous catalyst on the oligomerization of 1-decene to Polyalphaolefin (PAO), whereas it remains a big challenge to design heterogeneous catalyst with high catalytic...

Tuning the Ni site location of bifunctional Ni-based catalysts for improving the performance in ethylene oligomerization

“…However, reflections at 37.2°, 43.3°, and 62.9° corresponding to the (111), (200), and (220) planes of the NiO phase (JCPDS 04-0835) are perceived only in the PM-2.5% (2.5 wt% Ni) catalysts. 10,22,30 This result indicates that the Ni in IWI-2.5% (2.5 wt% Ni) and IE-2.5% (2.5 wt% Ni) samples shows good dispersibility in the carrier. Meanwhile, the uniform distribution of Ni can effectively avoid the deactivation of the catalyst due to the sintering effect, 31 thereby promoting the stability and reaction activity of the catalyst.…”

“…Solid acid heterogeneous catalysts are considered as a promising route due to their recycling and noncorrosive advantages. [7][8][9][10][11][12][13][14][15] The main active sites are nickel active sites and acidic sites on the bifunctional catalyst surface. [16][17][18] A number of studies reported the effect of metals on the catalytic performance.…”

“…8,11,26 Our previous work proved that Al-MCM-41 exhibited high activity on 1-decene oligomerization. 10 Herein, the IWI, IE, and PM methods were employed for controlling the distributions of Ni sites on the Al-MCM-41 support, as shown in Scheme 1. In addition, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and other characterization techniques were applied to reveal the Ni site distributions and properties of the prepared samples.…”

Ancillary ligand effects on α-olefin polymerization catalyzed by zirconium metallocene: a computational study

“…6 The commonly used catalysts for a-olen polymerization mainly include Lewis acid catalysts, Ziegler Natta catalysts, metallocene catalysts, ionic liquid catalysts, etc. [7][8][9][10][11][12][13][14][15][16] Among them, Ziegler Natta catalysts are traditional and the most common catalyst for olen polymerization. [17][18][19] However, because Ziegler Natta catalysts have multiple active sites, olens have different growth rates at different sites of catalyst, and the various properties of polymerization cannot be effectively controlled.…”

α-Olefin Trimerization for Lubricant Base Oils with Modified Chevron–Phillips Ethylene Trimerization Catalysts

“…Lubricant base oils are classified into five groups: groups I–III are obtained directly from petroleum refinery; group IV is synthetic hydrocarbons; and group V contains all other types. group IV base oils are synthesized through the oligomerization of α-olefins (typically, cationic oligomerization of 1-decene) and called poly­(α-olefin)­s (PAOs). − With high viscosity indices (VI >120) and outstanding oxidative stabilities, PAOs are treated as top-tier base oils and produced at a global annual scale of approximately 600,000 tons. , In the cationic oligomerization, a range of n -mers (such as a dimer, a trimer, or a tetramer) are simultaneously generated with a Shulz–Flory distribution, which are fractionated by energy-intensive distillation. Moreover, severe skeleton rearrangement generates many methyl groups along the carbon chains, resulting in the deterioration of oxidative stability .…”