CNT Support Research Articles

Hyperlipidaemia, alcohol abuse and acute pancreatitis.

Of 311 patients with primary acute pancreatitis, seven revealed major and seven minor lipid abnormalities on hospital admission. One pregnant woman suffered acute pancreatitis associated with Fredrickson type I hyperlipoproteinaemia. Twelve of the 13 men with types IV and V hyperlipoproteinaemia suffered alcohol abuse pancreatitis and represented 13.2 per cent of this aetiological group. However, only one of the 157 patients (0.6 per cent) with biliary disease had lipid abnormalities. Two of the 13 men died--the oldest, who had gallstones, and one with alcohol related disease. The remaining 11 were subject to follow-up (5-10 years). Six, who had improvement of their lipid abnormalities, had abstained from alcohol. The other five had a persistent lipid disorder, and all admitted continuing heavy alcohol ingestion. The clinical diagnosis of acute pancreatitis was supported by serum amylase elevation in only nine of the fourteen patients. Urinary amylase levels were consistent with the diagnosis in 11 of the 12 patients. Estimation of both serum and urinary amylase gave 100 per cent support to the clinical diagnosis of acute pancreatitis. Hyperlipidaemia associated with acute pancreatitis may be secondary to alcohol abuse but the possible role of HLP cannot be discounted. Urinary amylase is useful in diagnosing acute pancreatitis in the presence of hyperlipidaemia.

XPS characterization of carbon nanotube supported CoMo hydrodesulfurization catalysts

AbstractIn this paper, the effect of catalytic support and sulfiding method on the chemical state of supported Co‐MO catalysts is studied by XPS. After sulfidation with in‐situ method, the majority of molybdenum in CNT supported CoMo catalyst is transferred to a species with a formal chemical state Mo(IV) in MoS2 phase, and the rest to Mo(V) which consists of Mo coordinated both to O and S, such as MoO2S22‐‐ and MoO3S2‐−. In case of CoMo/γ‐Al2O3 catalyst sulfided with in‐situ method, a fraction of molybdenum is transferred to formal state Moo in the form of MoS2, but there is still a mount of unreduced Mo(VI) phase which is difficult to be sulfided. In CoMo/CNT catalytic system sulfided with ex‐situ method, Mo(IV) in the form of MoS2 is detected along with a portion of unreduced Mo(VI) phase, suggesting that not all the Mo phases are reduced and sulfided by ex‐situ method. As for CoMo/γ‐Al2O3, a portion of molybdenum is sulfided to intermediate reduced state Mo(V) which consists of Mo coordinated both to O and S. such as MoO2S2–2 and MoO3S2–, in addition, there is still a fraction of unreduced Mo(VI) phase. XPS analyses results suggest that CNT support facilitates the reduction and sulfidation of active species to a large extent, and that alumina support strongly interacts with active species, hereby producing a fraction of phase which resists complete sulfiding. Catalytic measurements of catalysts in the HDS of dibenzothiophene (DBT) show that CoMo/CNT catalysts are of higher HDS activity and selectivity than CoMo/γ‐A2O3 catalyst, which is in good relation with the sulfiding behavior of the corresponding catalyst.