liquefaction pathways of bituminous subbituminous coals andtheir

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, weight % MO loading on the Wyodak coal. Thus, it is reasonable to suspect that the extent of molybdate adsorption and the pH dependence are related to the organic heteroatom content. Also, mineral matter may play an important role in the adsorption. The protonation of alumina hydroxyl groups is responsible for the Creation of adsorption sites for molybdate on catalyst supports.' The clays or other minerals in the coal could behave in a similar fashion. It is of interest to compare these results with those obtained for some other coal samples. Table 2 compares the results obtained by Abotsi et al.' with the results obtained here. Since some of the experimental procedures are different, and the coals are not identical, the results are not strictly comparable. The solution concentration used by Abotsi was 4800 ppm whereas our highest concentration was 3000 ppm. However, the main points are readily discernable. There is a fairly large difference in the % Mo adsorbed between the bituminous and subbituminous coals. This may be due to the higher oxygen content of the latter. However, there are also differences within rank. The Montana Rosebud subbituminous coal (PSOC 1493) adsorbed about half as much Mo as did the Wyodak coal. Thus, the nature of the coal is also important to the adsorption mechanism. CONCLUSIONS: The extent of molybdate adsorption by coal is affected by the nature of the coal and the pH and molybdate concentration of the equilibration solution. Lower pH and higher molybdate concentrations favor molybdate adsorption. Such effects may be important to the art of catalyst impregnation. ACI-: The authors thank M s. Deborah Hreha and M s. Jodi Schuster who performed the AA analyses reported in this work and Jose Solar for many helpful discussions. DISCLAIMER: Reference in this report to any specific commercial product, process, or service is to facilitate understanding and does not necessarily imply its endorsement or favoring by the U.S. Department of Energy. BmxEKES 1. - Laskowski, J.S.; Parfitt, G.D. Surfactant Sci. Ser. 1989, 3.2, 279-327. 2. Solar, J.M.: Leon y Leon, C.A.: Osseo-Asare, K. Radovic, L.R. Carbon 1990, =(2/3), 369-375. 3. Abotsi, G.M.K.; Bota, K.B.: Saha, G. Energy Fuels 1992, 6(6), 779-782. 4. Vorres, K.S. Energy Fuels 1990, 4, 420-426. 5. Cruywagen, J.J.: De Wet, H.F. Polyhedron 1988, 2(7), 547- 556. 6. Spanos, N.; Vordonis, L.; Kordulis, Ch.; Lycourghiotis, A. J. Catal. 1990, a, 301-314. 516
Nominal 2 Table 1. Concentration of Molybdenum in Buffered Solutions COAL SUBBITUMINOUS 0.0116 100.72 600 0.1078 100.37 3000 60 600 I ca;- 1 Concen- lated tration Concen- Measured tration i by AA (ppm no) (ppm Mol 66+5 I (58%) 583 I 598526 0.5487 100.20 2960 29685225 (58%) 0 - 0114 100.60 62 6 625 (+8%) 0.1077 101.46 576 584227 1500 0.1325 50.21 1430 15 50+7 1 (25%) 3000 0.5484 100.22 2957 3152+175 I TABLE 2. Comparison of Molybdate Adsorption for Different Coals )I I BITUMINOUS PH % Mo on Coal % MO on Coal (Ref. 3) (This Work) 2 2.11 4.1 I 4 1.25 3.5 2 0.29 - >0.5 4 0.19 - >0.3 517
Page 1 and 2: LIQUEFACTION PATHWAYS OF BITUMINOUS
Page 3 and 4: the conversion of A+P and O+G with
Page 5 and 6: Asphaltcncs PrCasphaltenCS Cwr%, da
Page 7 and 8: NEW DIRECTIONS TO PRECONVERSION PRO
Page 9 and 10: ecause of incorporation of the coal
Page 11 and 12: should be considered more. The step
Page 13 and 14: 17 18 Run no. 0 cys I ToS-CyS TS-To
Page 15 and 16: INTRODUCTION Effects of Thermal and
Page 17 and 18: apid decline in modulus. The loss m
Page 19 and 20: -0.01- . 04 5 -0.03- E 6 -0.0s- c)
Page 21 and 22: Assessment of Small Particle Iron O
Page 23 and 24: yields are calculated by subtractin
Page 25 and 26: conversion is greater than the corr
Page 27 and 28: Table 3. Effect of Superfine Iron O
Page 29 and 30: EFFECT OF A CATALYST ON THE DISSOLU
Page 31 and 32: inherent volatility of Mo(CO), perm
Page 33 and 34: Analysis of the quantity and compos
Page 35 and 36: $ EO .- 0 m L 0 c 0 0 > 40 300 350
Page 37 and 38: 0 0 0 0 0.000 0.005 0.010 0.015 0.0
Page 39 and 40: of these studies indicate that cont
Page 41: Different levels of adsorption occu
Page 45 and 46: - iF m 1.6 1.4 1.2 - - - 1- 0 0.8 -
Page 47 and 48: RESULTS AND DISCUSSION Swelling of
Page 49 and 50: . . % . . 9 'HF 0 0 0 *. . 0 . . 0
Page 51 and 52: 1.50 KQ 1.00 0.50 I / ' 02 525 I 1
Page 53 and 54: hydrogen atoms. The hydrogen atoms
Page 55 and 56: D to generate more D atoms. It is r
Page 57 and 58: 12. a. Poutsma, M. L.; Dyer, C. W.
Page 59 and 60: Figure 3. Minimum Steps to Explin D
Page 61 and 62: Apoaratus and Procedure Microflow R
Page 63 and 64: Model ComDound Test Figure 5 shows
Page 65 and 66: Figure 1. High resolution gas chrom
Page 67 and 68: Figure 5. Product distribution for
Page 69 and 70: THQ at somewhat higher temperatures
Page 71 and 72: areas of the particles and the SEM
Page 73 and 74: Experimental Catalyst Precursors an
Page 75 and 76: impregnating solvent. Table 3 shows
Page 77 and 78: of MoCo-TC2 at the level of 0.5 wt%
Page 79 and 80: Table 4. Effect of Temperature Prog
Page 81 and 82: In the past, chemical treatments in
Page 83 and 84: The effect of Corn20 preaatment on
Page 85 and 86: Reaction Time Figure 1 - Schematic
Page 87 and 88: DISSOLUTION OF THE ARGONNE PREMIUM
Page 89 and 90: A much more def~tive trend is seen
Page 91 and 92: EFFECT OF CHLOROBENZENE TREATMENT O
Page 93 and 94:
same conditions and an extraction t
Page 95 and 96:
ACKNOWLEDGEMENT The authors thank t
Page 97 and 98:
THE STRUCTURAL &=RATION OF HUMINlTE
Page 99 and 100:
to be originally derived from demet
Page 101 and 102:
145 30 I --/---Jh I , , I I , 250 2
Page 103 and 104:
THE EFFECTS OF MOISTURE AND CATIONS
Page 105 and 106:
1 for the Zap lignite. These result
Page 107 and 108:
content of the samples ion-exchange
Page 109 and 110:
Table 1. F'yrolysis Results of Vacu
Page 111 and 112:
585 I
Page 113 and 114:
EFFECT OF TEMPERATURE, SAMPLE SI2E
Page 115 and 116:
of some of the thermobalance runs.
Page 117 and 118:
2. The mechanism of drying is a uni
Page 119 and 120:
Influence of Drying and Oxidation 0
Page 121 and 122:
"c gives W conversion mpared to the
Page 123 and 124:
Table 1. Products dismbutions (dmmf
Page 125 and 126:
- 50 45 40 E 35 2 30 E T) 25 ap 20
Page 127 and 128:
Influence of Drying and Oxidation o
Page 129 and 130:
FTIR . . of the L m To investigate
Page 131 and 132:
CONCLUSIONS The characexizntion of
Page 133 and 134:
A b S 0 r b a n C e A b s 0 r b a n
Page 135 and 136:
An NMR Investigation of the Effd of
Page 137 and 138:
for determining the area of the pea
Page 139 and 140:
of the ronl roniponcnte nnd (2) the
Page 141 and 142:
2w 180 160 9 140 120 P loo f 80 P O
Page 143 and 144:
25 I 20 ' + 0 Drying lime, hours Fi
Page 145 and 146:
substructure have been identified a
Page 147 and 148:
Pyridine extraction showed that 60
Page 149 and 150:
Figure 1. Reflected white-light pho
Page 151 and 152:
Table 3. Pyridine Extraction Sample
Page 153 and 154:
A bang-bang control strategy was us
Page 155 and 156:
increased from 120°C to 135”C, r
Page 157 and 158:
* wt% based on the amount of naphth
Page 159 and 160:
Use of Biocatalysts for the Solubil
Page 161 and 162:
Results Enzyme Modification with Di
Page 163 and 164:
Conclusions Reducing enzymes can be
Page 165 and 166:
Dynamics of the Extract Molecular-W
Page 167 and 168:
where yi = (x-xi !/pi. The zero mom
Page 169 and 170:
satisfactory agreement between theo
Page 171 and 172:
0.8 0.6 0.4 0.2 “E \ bo Y, - 1 0
Page 173 and 174:
The Use of Solid State C-13 NMR Spe
Page 175 and 176:
differences lie in the fact that th
Page 177 and 178:
I- z W 0 K W n PROTONATED AROMATIC
Page 179 and 180:
ZAP WIO SIDE CHAINS IN PYRIDINE EXT
Page 181 and 182:
ORGAFlIC VOLATILE MATER AND ITS SUL
Page 183 and 184:
(Figure 1). They indicated that the
Page 185 and 186:
Table 3. Elemental analysis of arom
Page 187:
1- 700'C Figure 3. GClFID chromatog
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