Novel approaches to the production of higher alcohols from synthesis gas. Quarterly Technical progress report No. 8, July 1, 1992--September 30, 1992 Page: 8 of 19
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+ Mass Balance Inaccuracies - Two complete mass balances were
performed during the blank run, and a minimum 50% error occurred in
the mass in versus mass out determinations. Complete re-calibrations of
the mass flow controllers and the wet test meter will be performed before
the next run.
- Oil Retention - After the run, only 20 ml of Drakeol remained in the
reactor; 175 ml of oil drained from the separator, and the remaining 100
ml is believed to have been carried out with the gas or lost during reactor
depressurization. The separator located after the reactor will discharge
its liquid contents directly back to the reactor, so the oil is not lost. Also,
reactor depressurization must be done slowly to ensure no significant
liquid discharge.
B) Task 3:
Syngas conversion to oxygenates was studied on rhodium on alumina
(Rh/A1203) catalysts using niobium (Nb), molybdenum (Mo), and tungsten
(W) as promoters. These catalysts were prepared either by impregnating
A1203 with an aqueous solution of metallic salt, using the incipient wetness
technique, or by adsorption of organometallic precursors onto A1203 or by
combinations of these two techniques. The catalysts were characterized
using Infrared (IR) spectroscopy and Extended X-Ray Absorption Fine
Structure (EXAFS) spectroscopy.
The literature provides a rationale for studying Nb as a promoter in
supported Rh/A1203 catalysts, with the goal of increased CO hydrogenation
selectivity to higher oxygenates. Ichikawa has reported that supported Rh
catalysts derived from [Rh4(CO)12] on Nb205 produced C2 oxygenates from
CO + H2 at atmospheric pressure with a carbon efficiency (CE) of 39%1. In
our work, the desired Rh/Nb/A1203 catalyst structure was highly dispersed Rh
clusters supported on a NbOx monolayer covering a high-surface-area
alumina (NbOX/Al203).
In addition to Nb, Mo and W were also used as promoters in Rh/A1203
1Ichikawa, M., Bull. Chem. Soc. Jpn., J. 2268-2273 (1978); Chem. Tech., 674 (1982).
7QTECH0008
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Roberts, G. & Kow, S. Novel approaches to the production of higher alcohols from synthesis gas. Quarterly Technical progress report No. 8, July 1, 1992--September 30, 1992, report, April 14, 1993; Raleigh, North Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1387513/m1/8/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.